Different toolbar for fragments and Navigation Drawer

Not sure if my approach is good, but I tried to add this public method to my activity:

public void setToolbar(Toolbar toolbar) {
    if(toolbar != null) {
        setSupportActionBar(toolbar);
        ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
                this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
        drawer.setDrawerListener(toggle);
        toggle.syncState();
    } else {
        drawer.setDrawerListener(null);
    }
}

and I added this in all fragments:

@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);
    ((MainActivity)getActivity()).setToolbar(toolbar);
}

@Override
public void onDestroyView() {
    ((MainActivity)getActivity()).setToolbar(null);
    super.onDestroyView();
}

It's working fine, but I'm not sure if it may cause a memory leak or any other performance issue. Maybe someone can help with it?

You can access main DrawerLayout from each Fragment just like the following code:

AppCompatActivity actionBar = (AppCompatActivity) getActivity();
actionBar.setSupportActionBar(toolbar);

DrawerLayout drawer = (DrawerLayout) actionBar.findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
            getActivity(), drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.setDrawerListener(toggle);
toggle.syncState();

If you want to use appbar(toolbar) that you specified in navigation drawer in different fragments with, for example different options menu items, you could make a public method in Main Activity where you specified your navigation drawer logic.

public void setToolbar(Toolbar toolbar, String title){
    AppCompatActivity actionBar = this;
    actionBar.setSupportActionBar(toolbar);

    DrawerLayout drawer = (DrawerLayout)actionBar.findViewById(R.id.drawer_layout);
    ActionBarDrawerToggle toogle = new ActionBarDrawerToggle(this, drawer, toolbar, R.string.drawer_open, R.string.drawer_close);
    drawer.addDrawerListener(toogle);
    toogle.setDrawerIndicatorEnabled(true);
    toogle.syncState();
    if(toolbar != null)
        toolbar.setTitle(title);
}

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Now you can use this method in your fragments to access the main toolbar and override it with your custom title, options menu... You can do this by creating a new toolbar variable in your fragment and then inflate it in onCreateView() method like this

toolbarFragment = (Toolbar)getActivity().findViewById(R.id.toolbar);

R.id.toolbar is the id of a toolbar that you specified in your layout file and it is the same id that you used in your main activity for the main toolbar.

---

Now you can call the method setToolbar(Toolbar toolbar, String title) in fragment like this

((MainActivity)getActivity()).setToolbar(toolbarFragment, "Some title");

---

If you want to use options menu for this fragment you have to call

setHasOptionsMenu(true);

in fragments onCreate() or onCreateView() methods. After that you can override method onCreateOptionsMenu() like this

@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
    super.onCreateOptionsMenu(menu, inflater);
    inflater.inflate(R.menu.custom_menu1, menu);
}

You can repeat this procedure for other fragments in your navigation drawer as well. Although it worked for me, I don't know if this violates activities or fragments lifecycle or causes memory leeks.